$B2-$B3/178-179: Pointer: Start Address of Tape Buffer
Points to $033C
Used by Jiffy-DOS: REGSAV ($B2)
Saved, then restored by Load routine (no other usage).
Kernal-Reference:
CMP ($B2),Y : $F7FF
LDA ($B2),Y : $F1A9 $F56E $F573 $F57F $F588 $F739 $F757
LDX $B2 : $F7D0
SBC ($B2),Y : $F583 $F58C
STA ($B2),Y : $F1F3 $F1FA $F3CE $F781 $F788 $F78D $F792 $F797 $F79C $F7AF
STX $B2 : $FD63
LDY $B3 : $F7D2
STY $B3 : $FD65
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